Question

全局变量不在一个线程中更新。

收到串行消息后，API应退出while循环并响应，但全局标志保持为0：

import sqlite3, time, datetime, random, random

class DatabaseManager(object):
    def __init__(self, db):
        self.conn = sqlite3.connect(db)
        self.conn.execute('pragma foreign_keys = on')
        self.conn.commit()
        self.c = self.conn.cursor()


    def query(self, arg):
        self.c.execute(arg)
        self.conn.commit()
        return self.c

    def fetch(self):
        self.c.fetchall()
        self.conn.commit()
        return self.c

    def __del__(self):
        self.conn.close()



dbmgr = DatabaseManager("connect.db")



while 1 > 0:

    def quantity():
        x = 1
        file = open("john.txt", "r")

        for line in file:
            x = random.randint(100,10000000)
            func = "INSERT INTO test (playerNAME) VALUES (?, ?)", line, x
            dbmgr.query(func)

当我通过api用“t”戳它时，我会得到一个响应：

#! /usr/bin/env python
from threading import Thread
import serial
import time
import web
import os

receivedFlag = 0;
last_received = ''
port = serial.Serial("/dev/ttyUSB1", baudrate=9600, timeout=1.0)

urls = (
  '/', 'index'
)

def receiving(ser):
    global last_received
    global last_toSend
    global receivedFlag
    buffer_string = ''
    while True:
        buffer_string = buffer_string + ser.read(ser.inWaiting())
        if '\n' in buffer_string:
            lines = buffer_string.split('\n')
            last_received = lines[-2]
            buffer_string = lines[-1]
            print "Serial < "+ last_received
            print "serial thread os.pid: " + str(os.getpid())
            receivedFlag = 1;

class index:
    def GET(self):
        global last_toSend
        global port
        global receivedFlag
        data = web.input()
        print "Recived: " + data.line
        port.write(data.line)
        receivedFlag = 0;

        while receivedFlag == 0:
            time.sleep(0.2)
            print "api thread os.pid: " + str(os.getpid()) +" Waiting for " + str(receivedFlag)            
        web.header('Content-Type', 'jsonp')
        print "Responding: " + last_received
        return "localJsonpCallback({\"box\": \"" + last_received + "\"})"

if __name__ == "__main__":
    time.sleep(1)
    print("Port open")
    Thread(target=receiving, args=(port,)).start()
    app = web.application(urls, globals())
    app.run()

更新：已编辑的os.pid代码

    Port open
http://0.0.0.0:9091/
Recived: t
Waiting for0
Waiting for0
Waiting for0
Waiting for0
Waiting for0
Serial < 1100D01H31M08S
Waiting for0
Waiting for0
Waiting for0
Waiting for0
Waiting for0
Waiting for0
.... 
and on and on

更新：尝试使用队列跨线程进行通信没有运气

Port open
http://0.0.0.0:9091/
Recived: t
api thread os.pid: 7942 Waiting for 0
api thread os.pid: 7942 Waiting for 0
api thread os.pid: 7942 Waiting for 0
api thread os.pid: 7942 Waiting for 0
api thread os.pid: 7942 Waiting for 0
Serial < 1100D00H00M00S
serial thread os.pid: 7942
api thread os.pid: 7942 Waiting for 0
api thread os.pid: 7942 Waiting for 0
api thread os.pid: 7942 Waiting for 0

输出：

#! /usr/bin/env python
from threading import Thread
import serial
import time
import web
import os
from Queue import Queue

qb = Queue()
port = serial.Serial("/dev/ttyUSB0", baudrate=9600, timeout=1.0)

urls = (
  '/', 'index'
)

def receiving(ser):
    global qb
    buffer_string = ''
    while True:
        buffer_string = buffer_string + ser.read(ser.inWaiting())
        if '\n' in buffer_string:
            lines = buffer_string.split('\n')
            line = lines[-2]
            qb.put(line)
            buffer_string = lines[-1]
            print "Serial < "+ line

class index:
    def GET(self):
        global port
        global qb
        data = web.input()
        print "Recived: " + data.line
        port.write(data.line)
        got = None
        while got == None:
            time.sleep(1)
            print "Waiting" + str(qb.qsize())
        got = qb.get()
        qb.task_done()  
        print "exitloop"
        web.header('Content-Type', 'jsonp')
        print "Responding: " + str(got)
        return "localJsonpCallback({\"box\": \"" + str(got) + "\"})"

if __name__ == "__main__":
    time.sleep(1)
    print("Port open")
    t1 = Thread(target=receiving, args=(port,))
    t1.start()
    app = web.application(urls, globals())
    app.run()
    t1.join()

Python全局变量线程不更新

0 个答案: